What we know about the measurement:

OSD Audio AP650 is a passive outdoor that cost around 200 USD for a pair.

  • Quality of the measurement data is high.
  • Origin of the data is ASR.
  • Format of the data is generated by a Klippel NFS .
  • Sensitivity: 83.2dB (avg. 100Hz-1kHz for 2.83V estimated at 1m)
  • -3dB (resp. -6db) point v.s. reference is at 95.2Hz (resp. 74.7Hz).
  • Reference level is normalised to -0.2dB computed over the frequency range [300.0Hz, 5000.0Hz].
  • Frequency deviation is 8.5dB over the same frequency range.
  • Directivity
    • Horizontal directivity is (-60.0°, 40.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
    • Vertical directivity is (-40.0°, 10.0°) between 1kHz and 10kHz. Angle computed for +/-6dB.
  • Tonality (Preference) Score
    • Tonality (Preference) Score is 1.1 and would be 4.28 with a perfect subwoofer.
      • Details: NBD: ON 0.895, LW 0.688, SP 0.442, PIR 0.45; SM: SP0.492, PIR0.076; LFQ 0.49, LFX 79Hz
    • Tonality (Preference) Score is 4.42 with an EQ and would be 6.79 with a perfect subwoofer and the same EQ.
      • Details: NBD: ON 0.759, LW 0.542, SP 0.446, PIR 0.356; SM: SP0.923, PIR0.889; LFQ 0.429, LFX 51Hz
  • Link to Original review.
OSD Audio AP650
AutomaticEQ (IIR)
Set preamp gain to: -3.0dB.
Type Freq Q Gain
5 106.0 0.51 2.99
3 478.0 1.23 1.73
3 844.0 0.68 -2.58
3 2226.0 2.97 -2.62
3 3438.0 2.99 -2.72
3 5490.0 1.83 -2.73
3 9691.0 0.58 -2.81
3 11843.0 0.52 -2.87
3 14965.0 0.59 -2.88
Download

These EQ optimise the Harman score and is a good start for far field listening like in your living room.

OSD Audio AP650 filters_auto_eq

AutomaticEQ

OSD Audio AP650 filters_eq_full

Target v.s. EQ

OSD Audio AP650
flipflop@ASR (IIR)
Set preamp gain to: -2.8dB.
Type Freq Q Gain
3 407.0 2.5 0.5
3 532.0 7.0 -0.7
3 625.0 12.0 -1.8
3 687.0 15.0 -1.0
3 756.0 10.0 -1.0
3 885.0 6.0 -2.7
3 1026.0 9.0 -2.8
3 1240.0 15.0 3.0
3 1528.0 6.5 2.3
3 1775.0 12.0 -0.9
3 1900.0 10.0 1.1
3 2105.0 12.0 -1.8
3 2310.0 18.0 1.4
3 2830.0 10.0 2.5
3 3730.0 12.0 -1.6
3 4040.0 10.0 2.2
3 4540.0 10.0 1.3
3 6400.0 1.1 -2.3
3 12200.0 1.4 -2.7
3 16900.0 1.1 -3.4
Download

These EQ is designed by ASR member flipflop.

OSD Audio AP650
Graphic EQ 15 bands
Set preamp gain to: -0.7dB.
Type Freq Q Gain
3 25.0 2.14 0.5
3 40.0 2.14 0.5
3 63.0 2.14 0.5
3 100.0 2.14 0.5
3 160.0 2.14 -0.25
3 250.0 2.14 0.0
3 400.0 2.14 0.0
3 630.0 2.14 -0.5
3 1000.0 2.14 -0.75
3 1600.0 2.14 0.0
3 2500.0 2.14 0.25
3 4000.0 2.14 -0.25
3 6300.0 2.14 -0.75
3 10000.0 2.14 -0.75
3 16000.0 2.14 -1.0
Download

These EQ is designed for a 15 bands graphical EQ.

OSD Audio AP650
Graphic EQ 31 bands
Set preamp gain to: -0.8dB.
Type Freq Q Gain
3 20.0 4.32 0.0
3 25.0 4.32 0.5
3 31.0 4.32 0.5
3 40.0 4.32 0.5
3 50.0 4.32 0.5
3 63.0 4.32 0.5
3 80.0 4.32 0.5
3 100.0 4.32 0.5
3 125.0 4.32 0.0
3 160.0 4.32 -0.25
3 200.0 4.32 -0.25
3 250.0 4.32 0.0
3 315.0 4.32 0.0
3 400.0 4.32 0.0
3 500.0 4.32 -0.25
3 630.0 4.32 -0.5
3 800.0 4.32 -0.5
3 1000.0 4.32 -0.75
3 1250.0 4.32 1.0
3 1600.0 4.32 0.0
3 2000.0 4.32 -0.25
3 2500.0 4.32 0.25
3 3150.0 4.32 0.0
3 4000.0 4.32 -0.25
3 5000.0 4.32 -0.5
3 6300.0 4.32 -0.75
3 8000.0 4.32 -0.75
3 10000.0 4.32 -0.75
3 12000.0 4.32 -1.0
3 16000.0 4.32 -1.0
3 20000.0 4.32 0.0
Download

These EQ is designed for a 31 bands graphical EQ.

OSD Audio AP650: comparison between EQs
OSD Audio AP650

Comparison betweens various EQs

OSD Audio AP650

Improvements made by EQ

Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
Frequency Frequency with EQ
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